Down draft-furnace



(No Model.) 3 Sheets-Sheet 2.

J. OBRIEN- 8v C. K. PICKLES.

DOWNDRAFT FURNAGE.-

No. 496,322. PatentedApr. 25, 1893.

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TH: annals Pneus co., Pnormuneo.. WASHINGTON o c (No Model.) 3 Sheets-Sheet 3.:

J. OBRIEN 82 G. K. P'IGKLES.

DOWNDRAFT FURNAGB. f

No. 496,322. Patented Apr, 25, 1893.. @I

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UNrrnD TATES JOHN OBRIEN AND CHARLES K. PIOKLES, OF ST. LOUIS, MISSOURI.

DOWN DRAFT-FU RNACE.

SPECIFICATION forming part of Letters Patent No. 496,322, dated April 25, 1.893.

Application filed April 30, 1892.

To all whom t may concern:

Be it known that we, JOHN OBRIEN and CHARLES K. PICKLES, both of the city of St. Louis, in the State of Missouri, have invented a certain new and useful Improvement in Downdraft-Furnaces, of which the following` is a full, clear, and exact description, reference being had to the accompanying drawings, forming part of this specification.

Our invention relates to certain improvements in what are known as down draft Water grate furnaces; and our invention consists in features of novelty hereinafter fully described and pointed out in the claims.

Figure I is a side elevation, part in se'ction; illustrative of ourinvention. Fig. lIis avertical section, taken on line II-II, Fig. I. Fig. III is part in top view, and part in horizontal view. Fig. IV is part in front elevation, and part in horizontal section. Fig. V is a detail view of a modification.

Referring to the drawings, 1 represents part of a steam boiler; 2, the combustion chamber of the furnace; 3, the hre-box; 4, the subire-box; 5, the grate, and 6 the sub-grate.

7 represents the ash-pit. The grate 5 is composed of a front manifold 8, and a rear manifold 9 connected by water tubes 10 and 1l, which are preferably arranged as shown in Fig. II,-the lower of the tubes lO being larger than the tube 11. The rear manifold 9 is connected by tubes or pipes 12 to the boiler; the pipes preferably extendinginto the boiler, as shown by dotted lines in Fig. I, so that their open, inner ends will be above the line of circulation of the water along the bottom of the boiler.

13 represents one ormore tanks which communicate with the boiler through pipes 14, and which communicate with the front manifold 8 through pipes 15. We have shown the pipes 14 as entering the water tanks at the outer ends of the latter, and have shown them extended along the tanks on the inside, so as to deliver the'water at the inner ends of the tanks, thus insuring a circulation of the water through the tanks; the pipes 15 communicating with the front ends of the tanks. We have shown the pipe l5 extending up a distance into the tanks, see dotted lines Fig. I, so that the clear water will be taken from the top of the tanks, allowing the sedi- Serial No.431,286. (No model.)

ment to settle in the bottom. On the upper ends of the pipes 15 are anges 15QM to keep the mud from entering the pipes by moving upward on their outer surfaces. This arrangement of the water tanks between the boiler and the water grate, which causes the water to pass from the boiler through the tanks before it reaches the water grate is particularly useful and desirable where muddy water is used, for the reason that the mudwill be settled in the tank 13, and not allowed to enter the water tank as will be understood.

In Fig. V we have shown the water grates located beneath the manifold, though we prefer to locate them above the manifold, as shown in the other figures, so that they will be subjected to the heat of the re box. In Fig. V we have shown the tank tr/aversed by a diaphragm 13a, which extends the full length of the tank, but does not extend quite to the bottom or top of the tank, leaving spaces 13b. placed in an inclined position, and its object is to insure a circulation of water through the tank before it escapes into the manifold.

The ash pit7 is elongated, and provided with a door 16. Within the ash-pit, beneath the sub-grate is a car 17, to receive the ashes as they fall from the grate. When the car is full it can be simply pulled out beneath the door 16, and the ashes removed from it, or it This diaphragm is preferably may be removed entirely from the lpit by v inserting track rails 18 in the outer end of the pit as shown by dotted lines in Fig. I. These rails may be removable, so that either method of unloading the car may be followed.

The track rails 19, upon which the car rests in the pit are preferably made inclined, so that the car can be easily moved toward the outer end of the pit when full.

In the drawings we have shown two ash cars 17, but it is evident that only one may be used, if desired.

30 represents the door of the fire-box hinged to the front plate of the boiler at 31, and provided with a loop 32 by which it is operated.

We claim as our invention- 1. The combination in a down-draft furnace, of hollow grate bars, a boiler, a tank, a communication between the boiler and the tank, a communication between the tank and the hollow grate bars, and `a pipe or pipes IOO 5 2. The combination in a down draft furnace, of hollow grate bars, a boiler, a tank, a pipe or pipes forming a. communication between the boiler and said tank, a pipe or pipes forming a communication between said tank and grate bars, and which extend a distance into the tank, and a pipe or pipes forming a communication between said gratebars and boiler, and which have no communication with said tank; substantially as and for the purpose set forth.

3. In a down-draft furnace, the combination of a water grate having a front and rear manifold, a pipe forming a communication between the rear manifold and the boiler, a tank, a pipe forming a communication between the tank and the boiler, and a pipe forming a communication between the tank and the front manifold, said latter pipe having a flange substantially as and for the purpose set forth.

4. In a dowirdraft furnace, the combination of a Watergrate, having a front and rear manifold, a pipe forming a communication between the rear manifold and the boiler, and which extends a distance into the boiler, a tank, a pipe forming a communication between the boiler and the tank, and which extends a distance into the tank, and a pipe forming a communication between the tank and the front manifold, and which extends a distance into the tank; substantially as and for the purpose set forth.

5. In a down-draft furnace, the combination of a water grate, a front and rear mauifold, a pipe forming a communication between the rear manifold and the boiler, a tank, a pipe formingl a communication between the boiler and the tank, a pipe forming a communication between the tank and the front manifold, anda diaphragm 13 located in said tank; substantially as and for the purpose set forth.

JOHN OBRIEN. CHARLES K. PICKLES.

In presence of- A. M. EBERSOLE, BENJN. A. KNIGHT. 

